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- 저자 : Lee. Changwoo (검색결과 451 건)
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NPP-VIIRS야간 위성영상과 국지적 공간 통계를 이용한 시가지 추출 가능성 평가
주뢰 ( Lei Zhu ),조대헌 ( Daeheon Cho ),전창우 ( Changwoo Jeon ),이소영 ( Soyoung Lee ) 한국도시지리학회 2016 한국도시지리학회지 Vol.19 No.3
Built-up area expansion has long been interested in the aspects of urbanization and land use change not only by academic studies on geography, but also by planners to make proper policies. This paper aims to evaluate the feasibility of NPP-VIIRS nighttime light data on built-up area extraction. Spatial statistical methods-local spatial association statistics (local SAS) (Getis and Ord`s G<sub>i</sub>*, Moran`s Ii, and Lee`s S<sub>i</sub>*) were applied to extract built-up area with NPP-VIIRS images. Central Korea including capital region, Gangwon, Chungnam (including Daejeon and Sejong) and Chungbuk was taken as the study area. Results of raw value and square value of nighttime light value(digital number) were both considered and the results and accuracies were evaluated with the reference data. The results show that: 1) in general, results of square value are more consistent with the reference data than those of raw value for both area comparison and classification accuracy in central Korea, especially for G<sub>i</sub>*; 2) for central Korea analysis, results of highly urbanized regions show a higher accuracy than those less urbanized in general, while the square value results of highly urbanized regions have higher accuracies, and raw value results are more accurate for regions with low urbanization level; 3) for subregional analysis, highly urbanized regions also have a higher accuracy, but contrary to the results of central Korea, raw value results have a higher accuracy in highly urbanized region, while square values perform better in less urbanized region for the urban extraction.
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Lee, Changwoo,Oh, Seungju,Yoo, Juyoul,Kim, Jinsung,Cho, Ahra,Cho, Yongsun 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.4
The objectives of this study is analysis of the characteristics of fire risk and survey of narrow dwelling space(the Karaoke, Gosiwon etc). The narrow dwelling space has special structure characteristics; the narrow and the complex escape rote. Gosiwon have very separate and exclusive space room, so have the problem a suppression of fire. Furthermore almost Karaokes located in basement have a complex and limitary escape rote. Therefore we should research and development the exploration equipment that search a source of the fire and a emergency rescuer in the scene of the fire.
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Lee, Changwoo,Kang, Dowoo,Oh, Seungju,Ham, Eungu,Cho, Yongsun 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.1
According to the statistics released by Ministry of Public Safety and Security, the number of restaurant fires in Korea reached around 2,400 and 169 damages of human life and damages to property was approximately over $8.8 billion for recent 3 years. It could be desirable having automatic commercial fire-extinguishing equipment at commercial facilities excluding housing facilities for the safety, applying at the place first where it has been more risky and expected fire can be occurred relatively because economical burden can be accelerated. In order to do this, adjust its level to meet the same level of the kitchen for 'Specific Target for Fire Fighting' that "gas leak alarm" has be equipped relevant regulations and it is considered and reasonable to expand the limit of application gradually.
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PVC 오수받이 내부 Z형 트랩의 동결성 평가에 관한 연구
Lee, Changwoo,Oh, Seungju 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.1
This study clarifies the simulation on freezing of remaining water in the Z-trap set up in the PVC sewage bay to control malodor. It made use of commercial FEM LAB program(ver. 3.2) well known as a solution of the problems arising in the flow of various fluid, heat transfer and mass transfer. Simulation results under the temperature $-20^{\circ}C$ outwards show that the water in the Z-trap set up in the sewage bay to control malodor freeze in the 60cm under the ground level after 14 days in the wet ground, and after 17 days in the regular ground. On the other hand, if the soil is dry even after the 42 days does not go down below freezing. Therefore, the water in the Z-trap was confirmed that it does not freeze.
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Lee, Changwoo,Choi, Beakyoul,Kim, Jinsung,Cho, Yongsun,Yoo, Juyoul 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.3
In this study, the fire analysis program FDS and Pathfinder was used to analysis a simulated accidental fire of a narrow dwelling space as a test bed. The results showed that the evacuation time of the H form internal building structure was the fastest at 285 seconds. In addition, when the automatic sprinkler system functioned with the entrances closed, the temperature distribution was lower and the visible smoke density was reduced.
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HAMILTONICITY OF QUASI-RANDOM GRAPHS
Lee, Tae Keug,Lee, Changwoo The Kangwon-Kyungki Mathematical Society 2002 한국수학논문집 Vol.10 No.1
It is well known that a random graph $G_{1/2}(n)$ is Hamiltonian almost surely. In this paper, we show that every quasirandom graph $G(n)$ with minimum degree $(1+o(1))n/2$ is also Hamiltonian.
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Reliability and Validity of the Appropriateness Evaluation Protocol for Public Hospitals in Korea
Lee, Clara,Kim, Stella Jung-Hyun,Lee, Changwoo,Shin, Euichul The Korean Society for Preventive Medicine 2019 예방의학회지 Vol.52 No.5
Objectives: This study was conducted to assess the applicability of the Appropriateness Evaluation Protocol (AEP) for public hospitals in Korea. Methods: In May 2016, 1500 admission claims were collected from Korean public district hospitals using stratified random sampling. Of these claims, 560 admissions to 37 hospitals were retrieved for analysis. Medical records administrators determined the appropriateness of admission using the criteria detailed in the AEP, and a physician separately assessed the appropriateness of admission based on her clinical judgment. To examine the applicability of the AEP, the concordance of the decisions made between a pair of AEP reviewers and between an AEP reviewer and a physician reviewer was compared. Results: The results showed an almost perfect inter-rater agreement between the AEP reviewers and a moderate agreement between the AEP reviewers and the physician. The sensitivity and specificity of the AEP were calculated as 0.86 and 0.56, respectively. Conclusions: Our findings suggest that the AEP could potentially be applied to Korean public hospitals as a reliable and valid instrument for assessing the appropriateness of admissions.
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